Reversible to irreversible transitions for ac driven skyrmions on periodic substrates
Using atomistic simulations, we investigate the dynamical behavior of magnetic skyrmions in dimer and trimer molecular crystal arrangements, as well as bipartite lattices at 3/2 and 5/2 fillings, under ac driving over a square array of anisotropy defects. For low ac amplitudes, at all fillings rever...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2024-01-01
|
| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/ad8f5a |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1846168132473847808 |
|---|---|
| author | J C Bellizotti Souza N P Vizarim C J O Reichhardt C Reichhardt P A Venegas |
| author_facet | J C Bellizotti Souza N P Vizarim C J O Reichhardt C Reichhardt P A Venegas |
| author_sort | J C Bellizotti Souza |
| collection | DOAJ |
| description | Using atomistic simulations, we investigate the dynamical behavior of magnetic skyrmions in dimer and trimer molecular crystal arrangements, as well as bipartite lattices at 3/2 and 5/2 fillings, under ac driving over a square array of anisotropy defects. For low ac amplitudes, at all fillings reversible motion appears in which the skyrmions return to their original positions at the end of each ac drive cycle and the diffusion is zero. We also identify two distinct irreversible regimes. The first is a translating regime in which the skyrmions form channels of flow in opposing directions and translate by one substrate lattice constant per ac drive cycle. The translating state appears in the dimer and trimer arrangements, and produces pronounced peaks in the diffusivity in the direction perpendicular to the external drive. For larger ac amplitudes, we find chaotic irreversible motion in which the skyrmions can randomly exchange places with each other over time, producing long-time diffusive behavior both parallel and perpendicular to the ac driving direction. |
| format | Article |
| id | doaj-art-bb978e4cb8e4460a80da4d6b6c18a8d9 |
| institution | Kabale University |
| issn | 1367-2630 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj-art-bb978e4cb8e4460a80da4d6b6c18a8d92024-11-14T07:31:10ZengIOP PublishingNew Journal of Physics1367-26302024-01-01261111300710.1088/1367-2630/ad8f5aReversible to irreversible transitions for ac driven skyrmions on periodic substratesJ C Bellizotti Souza0https://orcid.org/0000-0001-8149-5575N P Vizarim1https://orcid.org/0000-0002-2735-615XC J O Reichhardt2https://orcid.org/0000-0002-3487-5089C Reichhardt3https://orcid.org/0000-0002-0193-189XP A Venegas4POSMAT—Programa de Pós-Graduação em Ciência e Tecnologia de Materiais, São Paulo State University (UNESP) , School of Sciences, Bauru 17033-360, SP, BrazilDepartament of Electronics and Telecommunications Engineering, São Paulo State University (UNESP) , School of Engineering, São Jõao da Boa Vista 13876-750, SP, BrazilTheoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory , Los Alamos, NM 87545, United States of AmericaTheoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory , Los Alamos, NM 87545, United States of AmericaDepartment of Physics, São Paulo State University (UNESP) , School of Sciences, Bauru 17033-360, SP, BrazilUsing atomistic simulations, we investigate the dynamical behavior of magnetic skyrmions in dimer and trimer molecular crystal arrangements, as well as bipartite lattices at 3/2 and 5/2 fillings, under ac driving over a square array of anisotropy defects. For low ac amplitudes, at all fillings reversible motion appears in which the skyrmions return to their original positions at the end of each ac drive cycle and the diffusion is zero. We also identify two distinct irreversible regimes. The first is a translating regime in which the skyrmions form channels of flow in opposing directions and translate by one substrate lattice constant per ac drive cycle. The translating state appears in the dimer and trimer arrangements, and produces pronounced peaks in the diffusivity in the direction perpendicular to the external drive. For larger ac amplitudes, we find chaotic irreversible motion in which the skyrmions can randomly exchange places with each other over time, producing long-time diffusive behavior both parallel and perpendicular to the ac driving direction.https://doi.org/10.1088/1367-2630/ad8f5askyrmionsreversible to irreversible transitionsordered motion |
| spellingShingle | J C Bellizotti Souza N P Vizarim C J O Reichhardt C Reichhardt P A Venegas Reversible to irreversible transitions for ac driven skyrmions on periodic substrates New Journal of Physics skyrmions reversible to irreversible transitions ordered motion |
| title | Reversible to irreversible transitions for ac driven skyrmions on periodic substrates |
| title_full | Reversible to irreversible transitions for ac driven skyrmions on periodic substrates |
| title_fullStr | Reversible to irreversible transitions for ac driven skyrmions on periodic substrates |
| title_full_unstemmed | Reversible to irreversible transitions for ac driven skyrmions on periodic substrates |
| title_short | Reversible to irreversible transitions for ac driven skyrmions on periodic substrates |
| title_sort | reversible to irreversible transitions for ac driven skyrmions on periodic substrates |
| topic | skyrmions reversible to irreversible transitions ordered motion |
| url | https://doi.org/10.1088/1367-2630/ad8f5a |
| work_keys_str_mv | AT jcbellizottisouza reversibletoirreversibletransitionsforacdrivenskyrmionsonperiodicsubstrates AT npvizarim reversibletoirreversibletransitionsforacdrivenskyrmionsonperiodicsubstrates AT cjoreichhardt reversibletoirreversibletransitionsforacdrivenskyrmionsonperiodicsubstrates AT creichhardt reversibletoirreversibletransitionsforacdrivenskyrmionsonperiodicsubstrates AT pavenegas reversibletoirreversibletransitionsforacdrivenskyrmionsonperiodicsubstrates |